A computer-controlled creep setupwas employed to carry out a creep test of salt rock that lasted as long as 359 days under a constant uniaxial stress.
The relationship between the fractal tortuosity coefficient and the permeability is summarized in this paper, and there is a linear relationship between the two.
The final flow velocity of water and the time steps to stabilize the water velocity in the fissure are in linear correlation with the fracture angles and the fracture opening widths, respectively.
The results show that the maximum axial force is at the leg of stands; the minimum axial force is at the top of stents; shear force and bending moment at the top, legs and arch area of stand are higher;
The numerical simulation results show that the methane gas in the process of unsaturated seepage in the coal sample, gas pressure distribution of nonlinear phenomenon is obvious. But as the infiltration time ahead, the gas pressure distribution law gradually tends to be linear.
The max single sound detonator quantity could be calculated by the decay experience formula, then determined the burst size,the vibration of the mining area around the building could be controlled in a safe range of speed.
A scanning electron microscope(SEM) is employed to carry out an in-situ investigation of crack growth in unidirectional glass fiber-reinforced polymer(GFRP) composites under the different orientation angle of fibers.